<template>
  <view>
    <view class="search-box">
      <!-- 替换组件的搜索图标 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none" placeholder="请输入搜索内容"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        searchResults: [],
        
        // 搜索关键词的历史记录
        historyList: ['a', 'app', 'apple']
      };
    },
    computed:{
      historys(){
        return [...this.historyList].reverse();
      }
    },
    onLoad(){
     this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      input(e){
        clearTimeout(this.timer);
        // 输入框防抖处理
        this.timer = setTimeout(() => {
          console.log(e)
          this.kw = e;
          this.getSearchList();
        }, 500)
      },
      
      async getSearchList(){
        if(this.kw === ''){
          this.searchResults = []
          return;
        }
        try{
          const res = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw });
          if(res.meta.status !== 200) return uni.$showMsg();
          this.searchResults = res.message;
          this.saveSearchHistory();
        }catch(e){
          //TODO handle the exception
          uni.$showMsg();
        }
      },
      
      gotoDetail(goods_id){
        uni.navigateTo({
          url: `/subpkg/goods_detail/goods_detail?goods_id=${goods_id}`
        })
      },
      
      gotoGoodsList(kw){
        uni.navigateTo({
          url: `/subpkg/goods_list/goods_list?query=${kw}`
        })
      },
      
      saveSearchHistory(){
        // this.historyList.push(this.kw);
        const set = new Set(this.historyList);
        set.delete(this.kw);
        set.add(this.kw);
        this.historyList = Array.from(set);
        uni.setStorageSync('kw', JSON.stringify(this.historyList));
      },
      
      cleanHistory(){
        this.historyList = [];
        
        uni.setStorageSync('kw', '[]');
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list {
  padding: 0 5px;

  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .goods-name {
      // 文字不允许换行（单行文本）
      white-space: nowrap;
      // 溢出部分隐藏
      overflow: hidden;
      // 文本溢出后，使用 ... 代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
